2.4 - Muscular System

Question 1

What is isometric contraction?

Answer 1

When the muscle contracts but stays in a fixed position.

Question 2

What is isotonic contraction?

Answer 2

Muscle contraction that results in limb movement.

Question 3

What attaches muscles to bones?

Answer 3

Tendons

Question 4

What happens in an antagonistic pair?

Answer 4

When one muscle contracts the other relaxes

Question 5

Name two antagonistic pairs in the body.

Answer 5

Biceps and Triceps, Hamstring and quadriceps

Question 6

What action does the deltoid produce?

Answer 6

Abducts [takes away] the upper arm from the body e.g. serving in tennis when the arm goes above the head

Question 7

What action does the trapezius produce?

Answer 7

Rotates the shoulder blades (and scapular) backwards e.g. rowing

Question 8

What action does the latissimus dorsi produce?

Answer 8

Rotates upper arm at the shoulders e.g. swimming butterfly

Question 9

What action does the pectoral muscle produce?

Answer 9

Adducts the arm e.g. swimming front crawl

Question 10

What action do the abdominal muscles produce?

Answer 10

Flexes and rotates trunk e.g. rowing

Question 11

What action do the biceps produce?

Answer 11

Flexes arm at the elbow e.g. bending the arm to throw a cricket ball

Question 12

What action do the triceps produce?

Answer 12

Extends arm at the elbow e.g. straightening the arm to throw a cricket ball

Question 13

What action does the gluteus maximus produce?

Answer 13

Extends the upper leg e.g. running

Question 14

What action do the quadriceps produce?

Answer 14

Extends the leg at the knee e.g. kicking a football

Question 15

What action do hamstrings the produce?

Answer 15

Flexes the leg at the knee e.g. sprinting

Question 16

What action does the gastrocnemius produce?

Answer 16

Plantar flexes the foot e.g. running — pushing onto the toes